[PATCH v3] hwmon: (nct7802) add temperature sensor type attribute

From: Constantine Shulyupin
Date: Wed Jul 01 2015 - 02:52:53 EST

From: const <const@xxxxxxxxxxxxx>

Sensor type:
3 diode (current mode), MD=1
4 thermistor, MD=2

Reference:
Nuvoton Hardware Monitoring IC NCT7802Y
7.2.32 Mode Selection Register
Location : Index 22h

Signed-off-by: Constantine Shulyupin <const@xxxxxxxxxxxxx>
---
drivers/hwmon/nct7802.c | 72 ++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 60 insertions(+), 12 deletions(-)

diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c
index 1341e1f..afa242d 100644
--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -49,7 +49,7 @@ static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
#define REG_VOLTAGE_LOW 0x0f
#define REG_FANCOUNT_LOW 0x13
#define REG_START 0x21
-#define REG_MODE 0x22
+#define REG_MODE 0x22 /* 7.2.32 Mode Selection Register */
#define REG_PECI_ENABLE 0x23
#define REG_FAN_ENABLE 0x24
#define REG_VMON_ENABLE 0x25
@@ -66,6 +66,43 @@ struct nct7802_data {
struct mutex access_lock; /* for multi-byte read and write operations */
};

+static ssize_t show_temp_type(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nct7802_data *data = dev_get_drvdata(dev);
+ struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+ unsigned int mode;
+ int ret;
+
+ ret = regmap_read(data->regmap, REG_MODE, &mode);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%u\n", (mode >> (2 * sattr->index) & 3) + 2);
+}
+
+static ssize_t store_temp_type(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nct7802_data *data = dev_get_drvdata(dev);
+ struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+ unsigned int type;
+ int err;
+
+ err = kstrtouint(buf, 0, &type);
+ if (err < 0)
+ return err;
+ if (sattr->index == 2 && type != 4) /* RD3 */
+ return -EINVAL;
+ if (type < 3 || type > 4)
+ return -EINVAL;
+ err = regmap_update_bits(data->regmap, REG_MODE,
+ 3 << 2 * sattr->index, (type - 2) << 2 * sattr->index);
+ return err ? : count;
+}
+
+
static int nct7802_read_temp(struct nct7802_data *data,
u8 reg_temp, u8 reg_temp_low, int *temp)
{
@@ -377,6 +414,8 @@ store_beep(struct device *dev, struct device_attribute *attr, const char *buf,
return err ? : count;
}

+static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO | S_IWUSR,
+ show_temp_type, store_temp_type, 0);
static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0x01,
REG_TEMP_LSB);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp,
@@ -386,6 +425,8 @@ static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp,
static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp,
store_temp, 0x3a, 0);

+static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO | S_IWUSR,
+ show_temp_type, store_temp_type, 1);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0x02,
REG_TEMP_LSB);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp,
@@ -395,6 +436,8 @@ static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp,
static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp,
store_temp, 0x3b, 0);

+static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO | S_IWUSR,
+ show_temp_type, store_temp_type, 2);
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0x03,
REG_TEMP_LSB);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp,
@@ -475,6 +518,7 @@ static SENSOR_DEVICE_ATTR_2(temp6_beep, S_IRUGO | S_IWUSR, show_beep,
store_beep, 0x5c, 5);

static struct attribute *nct7802_temp_attrs[] = {
+ &sensor_dev_attr_temp1_type.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
@@ -485,7 +529,8 @@ static struct attribute *nct7802_temp_attrs[] = {
&sensor_dev_attr_temp1_fault.dev_attr.attr,
&sensor_dev_attr_temp1_beep.dev_attr.attr,

- &sensor_dev_attr_temp2_input.dev_attr.attr, /* 9 */
+ &sensor_dev_attr_temp2_type.dev_attr.attr, /* 10 */
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
@@ -495,7 +540,8 @@ static struct attribute *nct7802_temp_attrs[] = {
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_beep.dev_attr.attr,

- &sensor_dev_attr_temp3_input.dev_attr.attr, /* 18 */
+ &sensor_dev_attr_temp3_type.dev_attr.attr, /* 20 */
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
@@ -505,7 +551,7 @@ static struct attribute *nct7802_temp_attrs[] = {
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_beep.dev_attr.attr,

- &sensor_dev_attr_temp4_input.dev_attr.attr, /* 27 */
+ &sensor_dev_attr_temp4_input.dev_attr.attr, /* 30 */
&sensor_dev_attr_temp4_min.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp4_crit.dev_attr.attr,
@@ -514,7 +560,7 @@ static struct attribute *nct7802_temp_attrs[] = {
&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_beep.dev_attr.attr,

- &sensor_dev_attr_temp5_input.dev_attr.attr, /* 35 */
+ &sensor_dev_attr_temp5_input.dev_attr.attr, /* 38 */
&sensor_dev_attr_temp5_min.dev_attr.attr,
&sensor_dev_attr_temp5_max.dev_attr.attr,
&sensor_dev_attr_temp5_crit.dev_attr.attr,
@@ -523,7 +569,7 @@ static struct attribute *nct7802_temp_attrs[] = {
&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp5_beep.dev_attr.attr,

- &sensor_dev_attr_temp6_input.dev_attr.attr, /* 43 */
+ &sensor_dev_attr_temp6_input.dev_attr.attr, /* 46 */
&sensor_dev_attr_temp6_beep.dev_attr.attr,

NULL
@@ -541,25 +587,27 @@ static umode_t nct7802_temp_is_visible(struct kobject *kobj,
if (err < 0)
return 0;

- if (index < 9 &&
+ if (index < 10 &&
(reg & 03) != 0x01 && (reg & 0x03) != 0x02) /* RD1 */
return 0;
- if (index >= 9 && index < 18 &&
+
+ if (index >= 10 && index < 20 &&
(reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08) /* RD2 */
return 0;
- if (index >= 18 && index < 27 && (reg & 0x30) != 0x20) /* RD3 */
+ if (index >= 20 && index < 30 && (reg & 0x30) != 0x20) /* RD3 */
return 0;
- if (index >= 27 && index < 35) /* local */
+
+ if (index >= 30 && index < 38) /* local */
return attr->mode;

err = regmap_read(data->regmap, REG_PECI_ENABLE, &reg);
if (err < 0)
return 0;

- if (index >= 35 && index < 43 && !(reg & 0x01)) /* PECI 0 */
+ if (index >= 38 && index < 46 && !(reg & 0x01)) /* PECI 0 */
return 0;

- if (index >= 0x43 && (!(reg & 0x02))) /* PECI 1 */
+ if (index >= 0x46 && (!(reg & 0x02))) /* PECI 1 */
return 0;

return attr->mode;
--
1.9.1

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